Question: (a) For R = M2(Z), prove that is a subring of R. (b) What is the unity of R? (c) Does S have a unjty

(a) For R = M2(Z), prove that
(a) For R = M2(Z), prove that is a subring of

is a subring of R.
(b) What is the unity of R?
(c) Does S have a unjty ?
(d) Does S have any properties that R does not have?
(e) Is S an ideal of R?

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